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I'm running PrimalScript 2009 (5.0.630) Trial version.I open a WSF file using 'Edit with PrimalScript' by right-clicking on the file in the Windows Explorer.I open an embedded script in that WSF file and make some modifications without saving the script and without closing PrimalScript 2009.When I now open another WSF file in the same way, the embedded script was saved without any warning.I tried without the 'Allow only one instance' option, but when using the right-click 'Edit with PrimalScript' in Windows Explorer it always open in the same instance.

If you open a WSF file in workspace mode only one such file can be open at any time. Opening another workspace automatically saves all changes automatically.
If you want to discard your changes without saving, close the workspace manually and click "no" when prompted to save.